The GPM LU4038 centre gearbox is manufactured from 6061 T6 aluminium using CNC processes to achieve repeatable tolerances. The design reduces thermal buildup around the gear stack and provides rigid mounting points for bearings, decreasing axial and radial play. These tighter fits promote consistent gear alignment and a measurable improvement in steering response under load. The machined finish also supports maintenance and long term serviceability without adding unnecessary mass.